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I've used those diamond grit blades you mentioned with the Milwaukee super sawzall to cut cast myself. I've used on old cast when a snap cutter might not be a good option. If you have enough access around the pipe, any size grinder with the diamond blades you can buy at the depot will cut a lot faster than a recip with a diamond grit blade. Sooner or later, you'll find lots of stuff that diamond grinder blade will cut; I love em.

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Those diamond sawzall blades are slow and very costly. A diamond 4.5" grinder whell is cheap now and will smoke a sawzall. Even a 4.5" cut off wheel will kick butt. Only need access to less than 50 % of the pipe. You can plunge cut from the outside to the inside pretty easily.